Array attribute conditions work with proxied association collections. Closes #8318.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7133 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Array attribute conditions work with proxied association collections.  #8318 [kamal, theamazingrando]
+
 * Fix polymorphic has_one associations declared in an abstract class.  #8638 [lifofifo, daxhuiberts]
 
 * Fixed validates_associated should not stop on the first error #4276 [mrj/manfred/josh]

activerecord/lib/active_record/base.rb

@@ -1287,7 +1287,7 @@ module ActiveRecord #:nodoc:
         def attribute_condition(argument)
           case argument
             when nil   then "IS ?"
-            when Array then "IN (?)"
+            when Array, ActiveRecord::Associations::AssociationCollection then "IN (?)"
             when Range then "BETWEEN ? AND ?"
             else            "= ?"
           end

activerecord/test/finder_test.rb

@@ -8,7 +8,7 @@ require 'fixtures/developer'
 require 'fixtures/post'
 
 class FinderTest < Test::Unit::TestCase
-  fixtures :companies, :topics, :entrants, :developers, :developers_projects, :posts, :comments, :accounts
+  fixtures :companies, :topics, :entrants, :developers, :developers_projects, :posts, :comments, :accounts, :authors
 
   def test_find
     assert_equal(topics(:first).title, Topic.find(1).title)
@@ -159,6 +159,10 @@ class FinderTest < Test::Unit::TestCase
     assert_raises(ActiveRecord::RecordNotFound) { Topic.find(1, :conditions => { :approved => true }) }
   end
 
+  def test_find_on_association_proxy_conditions
+    assert_equal [1, 2, 3, 5, 6, 7, 8, 9, 10], Comment.find_all_by_post_id(authors(:david).posts).map(&:id).sort
+  end
+
   def test_find_on_hash_conditions_with_range
     assert_equal [1,2], Topic.find(:all, :conditions => { :id => 1..2 }).map(&:id).sort
     assert_raises(ActiveRecord::RecordNotFound) { Topic.find(1, :conditions => { :id => 2..3 }) }